They have carried out experiments for the ion exchange reaction between ions Cr2O7 solutions and ion exchange resin in the chloride form. The concentration profile is reported in equivalent amounts of Cr +6 with time, for 0.1, 0.5 and 0.75 gram of resin. The results indicate that longer times are required at 2500 seconds to reduce the concentration to less than 1 ppm of Cr +6 in a volume of 250 ml of solution stirred at 250 rpm, with an initial concentration of 50 ppm and a weight of 0.75 grams resin.

Were obtained dried calcium alginate beads of 1 mm diameter. The optimum pH for the biosorption of Cu (II) is between 4.5 and 5. The study of the kinetics of biosorption was determined that the thermodynamic equilibrium is reached after 24 h. The data fit very well with the Langmuir model, and shows that the maximum biosorption is Qmax = 80.6 mg / g.

They have carried out experiments for the ion exchange reaction between ions Cr2O7 solutions and ion exchange resin in the chloride form. The concentration profile is reported in equivalent amounts of Cr +6 with time, for 0.1, 0.5 and 0.75 gram of resin. The results indicate that longer times are required at 2500 seconds to reduce the concentration to less than 1 ppm of Cr +6 in a volume of 250 ml of solution stirred at 250 rpm, with an initial concentration of 50 ppm and a weight of 0.75 grams resin.

Were obtained dried calcium alginate beads of 1 mm diameter. The optimum pH for the biosorption of Cu (II) is between 4.5 and 5. The study of the kinetics of biosorption was determined that the thermodynamic equilibrium is reached after 24 h. The data fit very well with the Langmuir model, and shows that the maximum biosorption is Qmax = 80.6 mg / g.

Se ha investigado las propiedades de biosorción de la cáscara de naranja modificada. El pH óptimo para la biosorción del Pb2+ se encuentra entre 4,5 y 5,0. Del estudio de la cinética del proceso de biosorción se determinó que el equilibrio se alcanzó a las 4 horas. Las isotermas de biosorción se ajustan muy bien con los modelos de Langmuir y Freundlich. La máxima capacidad de biosorción del Pb (11) es qmax = 141 mg/g.

Se ha investigado las propiedades de biosorción de la cáscara de naranja modificada. El pH óptimo para la biosorción del Pb2+ se encuentra entre 4,5 y 5,0. Del estudio de la cinética del proceso de biosorción se determinó que el equilibrio se alcanzó a las 4 horas. Las isotermas de biosorción se ajustan muy bien con los modelos de Langmuir y Freundlich. La máxima capacidad de biosorción del Pb (11) es qmax = 141 mg/g.

Copper (11) adsorption properties of pre-treated biomass of marina algae Grateloupia doryophora (Rhodophyta) were investigated. The native biomass was treated with 0.2 M CaCl2, solution for 24 h under slow stirring. The solution pH was kept constant at pH = 5.0 using 0.1 M NaOH. The treated biomass was dried in an oven at 40ºC for 24 h. The adsorption capacity of the biomass strongly depends on equilibrium solution pH. At solution pH between 4 and 4,5 were observed the maximum adsorptive capacity of the pre-treated biomass.

Copper (11) adsorption properties of pre-treated biomass of marina algae Grateloupia doryophora (Rhodophyta) were investigated. The native biomass was treated with 0.2 M CaCl2, solution for 24 h under slow stirring. The solution pH was kept constant at pH = 5.0 using 0.1 M NaOH. The treated biomass was dried in an oven at 40ºC for 24 h. The adsorption capacity of the biomass strongly depends on equilibrium solution pH. At solution pH between 4 and 4,5 were observed the maximum adsorptive capacity of the pre-treated biomass.